Otiorhynchus (Nihus) grischunensis , Germann, Christoph, 2010

Germann, Christoph, 2010, Otiorhynchus (Nihus) grischunensis sp. n. — a new species of the O. rhilensis species group from the Swiss Alps (Curculionidae, Entiminae), Zootaxa 2368, pp. 59-68: 60-65

publication ID

http://doi.org/ 10.5281/zenodo.275803

persistent identifier

http://treatment.plazi.org/id/437887D6-6C2D-FFB9-FF1B-FB56FB81241D

treatment provided by

Plazi

scientific name

Otiorhynchus (Nihus) grischunensis
status

sp. n.

Otiorhynchus (Nihus) grischunensis  sp. n.

( Figs 1View FIGURE 1. O & 3–4View FIGURE 3View FIGURE 4)

Holotype ( Fig. 3View FIGURE 3 A): 1 Ƥ: 1 st label: Switzerland, Passo del Bernina, 2100 m a. s. l., N 799.000 / E 143.000 [ Swiss coordinates], sifted from litter and mosses, 24.8. 2001, leg. C. Germann; 2 nd label: Otiorhynchus muelleri Rosh.  det. P. Scherler 2001 [wrong determination]; 3 rd label: Otiorhynchus  ( Nihus  ) spec. L. Magnano det. 03; 4 th label (red): Holotype Otiorhynchus grischunensis  des. C. Germann 2009 ( NMBE). Note that the spermatheca of the holotype has been lost.

Paratypes ( Figs 1View FIGURE 1. O & 3View FIGURE 3 B): 2 Ex. 1 Ƥ: 1 st label: “ Suisse, Grisons, s/St. Moritz [above St. Moritz], 2100 m [a. s. l.], 21.9. 65 [1965], A. Comellini”; 2 nd label: Paratype Otiorhynchus grischunensis  des. C. Germann 2009 ( MHNG). 1 Ƥ: 1 st label: „Davoser Berge, 2500 m [a. s. l.], Dr. Wolf, Schiahorn 14.9.1932; 2 nd label: O. (s. str.) rhilensis Strl.  , det. Behne 1993; 3 rd label: bulgarische Art, Fundort verwechselt? [remark by Lutz Behne]; 4 th label (red): Paratype Otiorhynchus grischunensis  des. C. Germann 2009 ( MHNG).

Size: Length of body exclusive of rostrum, 3.3–3.5 mm.

Body colour: auburn to dark brown.

Head, rostrum and antennae: Colour auburn to dark brown. Rostrum covered with broad pale-brown scales, scales thinner towards rostral apex. Rostrum at insertion of antennae strongly bulged, half size of frons between eyes. Eyes bulged, protruding. Antennal scape strong, diverging in first fourth. First two segments of antennal funiculus longer than wide (L/B: 1 st: 1.5–1.6; 2 nd: 1.4–1.5), following five segments continuously broadened, wider than long (3 rd: 0.8 to 7 th: 0.5).

Pronotum: L/B: 0.8–0.85. Transverse, laterally strongly rounded, widest behind middle, more strongly constricted at front margin than at hind margin. Surface irregularly tuberculate, punctuate between tubercles.

Integument covered with adherent oval pale-grey scales, hardly longer than wide and raised rod-shaped scales, slightly diverging at apical third, scales four to five times longer than wide, arising from tips of tubercles.

O. rhilensis  species group O. proximus  species group

A) differences

- (rostrum longer) - (rostrum shorter)

- pronotum lengthend - pronotum rounded

- elytra lengthend - elytra rounded

- spiculum ventrale rounded (*) - spiculum ventrale concave/incised

- at high altitude in xeric habitats - mixted habitats (montane forests to alpine dwarf-shrub

heath)

- SE distribution (Caucasus, Turkey, Bulgaria, Greece, - NE distribution (Carpathian mountains to Austria and Dalmatia to Italy) and one species in Switzerland Italy)

B) species and subspecies

O. abruzzensis Stierlin, 1892  O. ardealicus Penecke, 1927  O. boroveci Magnano, 2001  O. carpathicus Daniel & Daniel, 1898  O. grischunensis  sp. n. O. globulus Gredler, 1866 

O. khatiparicus Davidian & Arzanov, 2006  O. hypsibatus Ganglbauer, 1896  O. leonhardi Reitter, 1903  O. noskiewiczi Smreczynski, 1959  O. meoticus Davidian & Arzanov, 2006  O. poianae Penecke, 1927 

O. rhilensis Stierlin, 1888  O. praetutiorum Di Marco & Osella, 1998  O. uludagicus Magnano, 2001  O. proximus proximus, Stierlin, 1861  O. winkelmanni Magnano, 2004  O. proximus depauperatus Penecke, 1935 

O. proximus iteratus Magnano, 2001 

O. salassorum Magnano, 1979 

O. sp. n. ( Di Marco & Osella 1998, i. l.)

Elytra: L/B: 1.25–1.26. Pear-shaped, shoulders rounded, widest slightly behind the middle. Integument covered with three types of pale-brown scales: (I) oval, hardly longer than wide, adherent, (II) small, short rod shaped raised scales, three times longer than wide, and (III) long raised rod-shaped scales, three to four times longer than wide, diverging at middle, arising from interspaces. Interspaces flat and loosely covered with mostly four rows of type I scales. Scales of type II arise between distinct punctures of striae.

Legs: Auburn coloured, densely covered with various types of pale-brown scales, all femora unarmed.

Spiculum ventrale, spermatheca and ovipositor: ( Figs 4View FIGURE 4 A –C)

Differential diagnosis: Otiorhynchus grischunensis  belongs to the O. rhilensis  species group with a more elongate elytra and a rounded (not clearly incised) anterior margin of the spiculum ( Fig. 4View FIGURE 4). Among external morphological characters and such (female) genitalic characters as the spiculum ventrale and spermatheca, O. grischunensis  sp. n. shows great similarity to O. rhilensis  ( Figs 1–3View FIGURE 1. OView FIGURE 2. OView FIGURE 3). Otiorhynchus rhilensis  is known to be a polymorphic species ( Magnano, 1979, 2001a) comprising both, bisexual and parthenogenetic populations ( Magnano, 2004) and showing considerable variability ( Figs 3View FIGURE 3 C –F). At present, O. grischunensis  is known only from females. The following morphological differences between O. grischunensis  and O. rhilensis  are based on comparison with O. rhilensis  specimens from several localities (populations) to ensure the reliability of the traits used (Appendix 1).

O. grischunensis  differs from O. rhilensis  in:

- the pear-shape of the elytra with the shoulders completely rounded ( Fig. 1View FIGURE 1. O) in O. grischunensis  (in O. rhilensis  the shape varies from rounded to elongated and the shoulders are not completely rounded ( Figs 2View FIGURE 2. O & 3View FIGURE 3 C –F))

- laterally, pronotum and elytra are swollen ( Fig. 1View FIGURE 1. O) (in O. rhilensis  pronotum and elytra are flattened on the discal areas ( Fig. 2View FIGURE 2. O))

- the scales on the interspaces on the elytra are small, four scales easily cover the width (in O. rhilensis  the scales on the interspaces are larger and usually three scales cover the width of the interspaces, in some specimens (Slavianka, S Goleschovo, Fig. 3View FIGURE 3 F), striae are completely covered with dense scales)

- the body (habitus) is generally larger and more rounded ( Fig. 1View FIGURE 1. O) ( O. rhilensis  is smaller and more slender ( Figs 2View FIGURE 2. O & 3View FIGURE 3 C –F))

- base of the spiculum ventrale is rectangular to trapezoid with basal branches converging at a sharp angle ( Figs 4View FIGURE 4 A –C) (in O. rhilensis  the base is rounded with the angle of basal branches less sharp ( Figs 4View FIGURE 4 D –F) Bionomy: The holotype was collected by sifting mosses and lichens as well as leaf litter under dwarfshrub heath ( Rhododendron  , Vaccinium  ) above 2100 m a. s. l. ( Fig. 5View FIGURE 5). Together with O. grischunensis  the following Curculionidae-species were found (ordered by dominance): Otiorhynchus pauxillus Rosenhauer, 1847  , O. pupillatus Gyllenhal, 1834  , O. varius Boheman, 1843  and Dichotrachelus imhoffi Stierlin, 1857  .

Derivation of Species Name: The name “ grischunensis  ” is a Latinized adjective of the region where the species was found, the canton Grisons, in the written language Romantsch Grischun.

NMBE

Naturhistorisches Museum der Burgergemeinde Bern

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Curculionidae

Genus

Otiorhynchus

Loc

Otiorhynchus (Nihus) grischunensis

Germann, Christoph 2010
2010
Loc

O . khatiparicus

Davidian & Arzanov 2006
2006
Loc

O . meoticus

Davidian & Arzanov 2006
2006
Loc

O . winkelmanni

Magnano 2004
2004
Loc

O . uludagicus

Magnano 2001
2001
Loc

O . proximus iteratus

Magnano 2001
2001
Loc

O . praetutiorum

Di Marco & Osella 1998
1998
Loc

O . salassorum

Magnano 1979
1979
Loc

O . noskiewiczi

Smreczynski 1959
1959
Loc

O . proximus depauperatus

Penecke 1935
1935
Loc

O . poianae

Penecke 1927
1927
Loc

O . leonhardi

Reitter 1903
1903
Loc

O . hypsibatus

Ganglbauer 1896
1896
Loc

O . rhilensis

Stierlin 1888
1888
Loc

O . proximus proximus

Stierlin 1861
1861